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Apparent Frequency:Listener Moving

The engine of...

Question

The engine of a train sounds a whistle at frequency $(f)$ . The frequency heard by a passenger is

A

\frac{1}{f}

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B

> f

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C

< f

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D

f

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Solution

The correct option is D $f$
Doppler's effect is not observed when there is no relative motion between the source and the observer. Hence he will hear the same frequency.

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Apparent Frequency:Listener Moving

Standard XII Physics

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